AQA Physics Unit 1 PHYA1 20th May 2013

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Nah mate, they meant between Leptons and Hadrons, as far as I could tell. I wrote the differences between both of them anyway. But I think they meant leptons and hadrons.

1 thing how many similarities are between hadrons and leptons

Reply 921

Maloneyyy

Original post by Ephixa

1 thing how many similarities are between hadrons and leptons

I put that they were both matter and anti-matter and that leptons could decay into hadrons

Reply 922

Son234

Original post by 123456789012

What did you get for the specific charge? I got 4.0x10^7 Ckg^-1.

Specific charge-->

(20X1.6X10^-19)/(20X1.673x10^-27)+(28X1.675x10^-27)=

4.0X10^7 CKg-1

Yep :biggrin:

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Reply 923

TheBeesKnees

Original post by 123456789012

What did you get for the specific charge? I got 4.0x10^7 Ckg^-1.

yes that definitely rings a bell - i think I wrote down 3.99 x 10^7 or something like that.

Reply 924

Monster94

Original post by jazzynutter

How many similarities between hadrons and leptons were we supposed to come up with?

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I got one, I said that Hadrons and Leptons both interact via the EMF if the particles are charged.

Reply 925

Ryejd

the charge was 2+ so it's 2*1.6*10/19 over the mass

Reply 926

samueliscool

Original post by Son234

Specific charge-->

(20X1.6X10^-19)/(20X1.673x10^-27)+(28X1.675x10^-27)=

4.0X10^7 CKg-1

Yep :biggrin:

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I got to the power of 6, as I thought the charge was 2x1.6x10^-19 as there are two more protons than electrons?

Reply 927

bo536

Original post by Maloneyyy

leptons could decay into hadrons

I'd be very careful with that one...

Reply 928

Maloneyyy

Original post by Son234

Specific charge-->

(20X1.6X10^-19)/(20X1.673x10^-27)+(28X1.675x10^-27)=

4.0X10^7 CKg-1

Yep :biggrin:

This was posted from The Student Room's iPhone/iPad App

Would it not be (38X1.6X10^-19)/(48X1.67X10^-27) because it was the specific charge of the ion and not just the nucleus so the charge would be the protons and the electrons over the mass?

Reply 929

Ryejd

Original post by samueliscool

I got to the power of 6, as I thought the charge was 2x1.6x10^-19 as there are two more protons than electrons?

you are correct

Reply 930

Notorious544d

Original post by 123456789012

4.0x10^6

I also got this, using charge as +2 not +20. But now I'm thinking about it, I forgot to add the masses of the electrons.
Edit, just did a calculation including masses of electrons but I still got 4x10^6. I guess the masses of electrons is negligible.

(edited 10 years ago)

Reply 931

lookbehindyouNOW

similarities were that they both have antiparticles

Reply 932

Ryejd

Original post by Notorious544d

I also got this, using charge as +2 not +20. But now I'm thinking about it, I forgot to add the masses of the electrons.

mass of electrons is negligible, not once have I seen you have to include their masses.

Reply 933

Goods

For the prove that energy is conserved i used v^2/R and rounded values of R think I will lose a mark for that?

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Reply 934

TheSnail

Anyone got an unofficial mark scheme?

Reply 935

samueliscool

Original post by Notorious544d

I also got this, using charge as +2 not +20. But now I'm thinking about it, I forgot to add the masses of the electrons.

I believe the masses of the electrons are so negligible that it doesn't influence the specific charge :smile:

Reply 936

lebron_23

Original post by samueliscool

I got to the power of 6, as I thought the charge was 2x1.6x10^-19 as there are two more protons than electrons?

As did I. Not entirely sure what the other poster means, but I did the sameas you. Charge was +3.2x10^6. We could, of course, be wrong..

Electricity was killer though.. Probably dropped most of the marks available there :redface:

Any idea if there will be a mark scheme up for this, similar to how they do it for maths?

(edited 10 years ago)

Reply 937

Ryejd

Original post by lebron_23

As did I. Not entirely sure what the other poster means but I did the same. Charge was +3.2x10^6. We could, of course, be wrong..

you are correct. I've seen this in many past papers

the mass of electrons is negligable, you never include it

Reply 938

Son234

Original post by Maloneyyy

Would it not be (38X1.6X10^-19)/(48X1.67X10^-27) because it was the specific charge of the ion and not just the nucleus so the charge would be the protons and the electrons over the mass?

Hmm I think your right it was the ion?!

In that case it would be 38! Im not sure if it was the nucleus or the ion they asked for

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